318 budget build help?

Mostly what everyone here has said will greatly improve the performance of your 318.
Before you choose split pattern or single, consider things like headers or manifolds? Porting or no porting? Despite raw flow numbers...bolting on intakes usually hurt intake flow meanwhile slapping on headers picks up exh flow.
If all that too much to ponder ....then just do the following 'pretty much the same' mods/bolt ons...
600 carb, performer or action plus int manifold , hyd 340 spec cam or something like a 262* .460 lift 112cl , headers, and if you can at least do this...mill the heads .040