Question on 302 heads for a 318

is there a specfic year 340 or any Mopar 340 springs would work? Should i get roller rocker arms or stay stock?
All 340's use the same springs, IIRC.

do you guys think i shoud get new pushrods and lifters?
Lifters come with the new cam in most cases. Yes! Would be the answer!
Hold off on pushrods. Reuse what you can.

just NEW stock lifters ?
Yes.

but getting back to the heads. What kind or rocker arms should I run? Stock or Roller? I found a roller kit online at Kragen Auto Parts for all the rockers and rocker shafts. Is that something I might want to look into or just keep everything stock?
Nothing wrong with stock units. Roller start n the area of $400 and may require cutom rods.

Do you knwo the mopar proformance part # for the camshaft and lifters?
In the MoPar performance catologs and performance books (Or anybody else's, they list the part numbers for purchase.

After reveiw al the questions you have posted since I left. I'm going to take a stab on something abd say your a newbie to engines and stuff. You need to do 2 things in my opinion so take this as advice for the better.

1. Grab a few books. I do think so very much that after reading "How to rebuild your small block MoPar engine" you will be very much more informed and enlightened with a good sense of understanding just how things are going to go and why they should take a certain direction.

This is a very good book to start with. After that, if you so desire to get into hot rodding, the "How to hot rod your small block MoPar" is also excellent followed by books from Chrysler/MoPar. The engines and chassis books are excellent as well.

2. Grab a local gear head/mechanic willing to help show you through the ropes and/or mentor you in the process.

Stick around some, read up here on the forum. We'll try and help ya through what we can. Theres a great bunch here.