So I am pretty new to building engines and i have a 79 302 block that i am putting gt40 heads on. When I go to tighten down the rocker arms, the bolt bottoms out while the rocker is still loose. I got all the valvetrain from the machine shop that I bought the heads from and they’re no help...

I have a 66 mustang that I am swapping a 68 302 into. I bought a pair of GT40 heads, not gt40p, and I was looking to see what all I need to make them fit on my motor that has a .475/.475 cam, flat top pistons, and a weiand stealth intake manifold? I was planning to use JEGS long tube headers...