Two questions

[curtis73]

You can certainly add whatever parts you want if you check clearances, etc. The point is that you may notice gaining 30 hp by using a certain cam, but by matching the head flow, intake runner design, and exhaust tuning to the new cam, not only might you net a 90-hp increase, your drivability will most likely not suffer like it would with mismatched parts. Maybe some other users know of some websites with good calculators that may help you match your parts. There are formulas to determine best parameters of intake runner length, header tube length, port flow, exhaust diameter, etc. Some of them you enter displacement, desired hp, and sometimes RPM range, and it spits out some approximate targets for the above parameters.

I'm going to be building two similar engines in the future. One is a 307 Olds (similar outputs and parameters to the 5.0 with a less desirable bore/stroke ratio) and a 302 Ford.

The Olds will be getting ported and milled stock 5A iron heads, 8.7:1 compression for 87 octane, a 210/216-degree at 50 cam with about a 1/2" lift, Edelbrock intake, and a 500 CFM Edelbrock carb. RPM range will be 1200-5500.

The Ford will be getting either Twisted Wedge aluminum heads or Edelbrock aluminum, about 10:1 compression, a 218/226 cam with .512 lift, An Edelbrock intake with (of all things) a Q-jet carb. RPM range will be 1500-6000.

The fun part? The Ford is going in my Cutlass where the 307 used to be.