Compression vs boost question

well i think 300's about the cheapest possible thing i can do, i can hardly get the gaskets for the other engine for that! I have another car to commute with but im buying this engine because i dont have the funds yet to build the other one completly how it should be done and i would like to have the car driving again soon, ive really missed it. so while im happy havin my cuda back with a decent engine i can save my money an spend time building the 360 without the car gathering dust and taking up shop space. and even if i put 20k miles on the 318 and pull for the it for the 360 and resell it im not gonna lose any money on it, no worries~