Non H.O engine

[5ive.oh]

I have a 302 from 1975. Will the GT40p heads work? Are the only differences in the HO and non HO engine the heads and cam? The engine has E7TE heads on it now, and some real agressive cam of unknown origin.

 

[R2D2]

its non factory hydraulic roller block, other than that, no difference

 

[5ive.oh]

How do I check pushrod length without a special tool?