Best 273 and 318 builds (NO 360's please)

You mean something like this?
Here is mine plan..
never had a 273 before or even a mild 318?

Start with a 273 add a comp cam 268h cam and double roller chain, J heads with the smaller 188 in, and 160 ex valves with heads milled for compression (If I cant find a good set of 302s) and a holly 600 double pumper on a performer manifold (cause I have it) with Mallory electronic dizzy and MSD ignition, {this plan is open to suggestions} but keep in mind it is a TRUE budget motor and will replace the slant in the Duster,... since I also have a 360 project in the works that soon (I hope) go in the 391 geared mini tub'd 67 Dart!
let me know what you think!! since Ive gotten this plan by reading on this site!
thanks
Bruce B.