Inputs on a home built 318 for red light to red light fun

Dan the man said
His choice of cylinder heads will keep him from reaching his goal, as I said earlier, there are a small port small valve cylinder head and they will hinder the performance of a cam that he wants to spin it 7,500 rpm's. Am I correct here?

Yes and no. It’ll spin that high of the valve springs control the valve. The head will flow only so much air, any head, this is a limitation to power, not rpm.
I said this earlier.

Branden Finkenbinder said
Had plans to port them and put in larger valves or won't that make a difference?

Yes, it’ll make a difference. More power up top.

Dan the man said
Porting along with bigger valve's will help, but the overall port size will still be to small to support 7,500 rpms.

This is incorrect and I’d wish you’d stop saying that. It just shows those who know you don’t know what your talking about and your giving ill advice in this manor.

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You need cylinder heads that have bigger intake runners, like 170cc or 180cc. Those 273 rocker arms are probably 50+ years old and I wouldn't trust them for your application. Some on here will probably disagree with me but those rocker arms have been known to break. You'd be better off with a set of aluminum roller rockers. What intake manifold you plan on getting?

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I agree on more cylinder head. Even more than you suggest. The rockers can hold only so much spring pressure. The Hyd or solid cam springs should be just fine for this. This is also why I suggested to have them looked over and have the ratio corrected. If there is a short coming round, you’ll be told.