67 Cuda 273 replacement options

Since my 273 was seized and pulled already when I got the car, I picked up a super cheap basically stock 318 with about 2k miles on it. People practically give these things away. I'm swapping cams and actually rebuilding the 273 heads to swap on (higher compression). I'm guessing I should have close to 300hp for about 1000 bones total in the engine, carb to oil pan. Machine work alone is going to cost at least 4-500 bucks on any engine you build.