Installing a 4bbl on a 273 advice

I put an Edelbrock manifold and 600cfm 4 bbl for a 318 on my 1964 273. The intake manifold to head bolt holes on the early 273 are at a different angle than the later 273's, 318, 340 motors. I had the modify the manifold to bolt it to my early 273.
I did some porting on the heads and added a mild hydraulic lifter cam of about 205 duration at .050 and 2 1/2 inch dual exhaust. My motor was an original 2 bbl motor and I believe it would have benefited from higher compression and at some point, I would like to try a 500 cfm carb, but for a small V8 runs pretty well.