Rebuild 318 or go Crate

I'm getting ready to pull the trigger on getting my 68 Dart 318 road worthy and am having trouble deciding on whether to rebuild the 318 or replace with a crate engine. I was really trying to keep my costs this year to $6k...but it seems like this may be unrealistic with the goals I have. I'll use the car for street driving and am considering making it a daily driver. Although I'd like to do more of the work myself, I don't have a garage large enough to house the car and tools with space left to work. (1960's house) So I would doing most of the work outside under canopy, which wouldn't be very clean. My objectives right now are as follows...I was hoping some of you could weigh in given your experience...thanks in advance!

- Improve output to >300HP
- Upgrade brakes with hydratech boost running off PS pump, with Disc in the front (will upgrade from 5 x 4 bolt pattern to 5 x 4.5)
- Upgrade wheels and tires (17x7/18x8)

I live in St. Pete, which is an older community with some pretty good machine shops around...so I first started with seeing how much a rebuild would be. I found a machine shop called Pyramid, which will do the rebuild for $2k. This seemed pretty reasonable so I started looking into the mods I would want to make in order to achieve the output I'm looking for (>300HP)

- Engine Rebuild - $2000
- New Intake (Dual Plane Air Gap RPM) - $259
- New Heads (Aluminum Edelbrock) - 2 * $800
- New Carb (Edelbrock 600CFM) - $300
- Headers - $750
- Dual Exhaust - $748
- New Cam - $200
- Electronic Ignition - $236

Total: $6093 (before upgrading brakes: $850 for hydratech, $800 for disc brake conversion)

Of course there's all the unforeseen costs...like taking the Engine out and putting it back in...and I would try to work with the machine shop to include installation of the upgraded components as part of the rebuild since they won't have to touch the heads, etc.

The alternative to all this would be go for a crate motor...which it seems after searching for a few weeks that I won't be able to get a turn-key solution for less than $5k. The benefit seems to be I would have a dnyo-tested engine with warranty that should work right out of the box. It would also give me the opportunity to upgrade to a large CI..such as 360. However a crate engine plus the headers and exhaust would put me way over budget for this year and it seems sometimes it can be hit or miss depending on the company you use. One last dart I'm throwing today is to stop by Napa to see how much their crate engines are.

I suppose another option is to just have the machine shop do the engine rebuild and drive the stock 318 around as is for awhile while taking care of the brakes, wheels, etc. I wouldn't be able to work on the exhaust though if I wanted to upgrade the size of the block anytime soon. I appreciate any feedback you have!

Oh, one other thing--if I upgrade to disc brakes in the front and get to a 5x4.5 bolt pattern, anyone have any idea on how I can get the rear from 5x4 up to 5x4.5 as well so I can buy wheels that are all 4.5 bolt pattern without having to upgrade the rear end right now?