318 parts list

Machining the block should be considered the first step for a performance engine, not something to avoid. If you want (or need) to be able to drive the car while upgrades are made, get a second engine to build. A 318 core isn't going to cost a lot in the greater scheme of things. Best bet if you really want to avoid machine work would be to look for a low mile 5.2 Magnum out of a Ram/Durango/Dakota/Jeep. It will be a far better starting place than a 75 LA 318 anyhow.