trying to pull ponnies with little cash

V10 isn't worth the trouble, might as well try to swap in a Gas Turbine engine from a helicopter LOL... Just rebuild your 318 for now and thrash the hell out of it, they are a dime a dozen so you can have all the fun in the world trying to blow it up and just grab another one for a couple hundred to throw in. I drove mine until it burnt a quart of oil a week and it still kept up with my buddy's modded '02 Subaru WRX. Don't forget we're talking about a ~3200-lb. car with a 5.2-liter V8, that's pretty ballsy in itself. Nowadays most cars that light either have turbo 4-bangers or cost $60k+ (Vette, Viper, etc.)