The Wittek tower clamps are pretty finicky. I do a little prep to them before I install and I'm super careful when I clamp them down usually using vice grips to keep them straight. Even then I always have extra because some just don't hold. Hadn't heard of the PowerGrip clamps. They look pretty easy!
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Ken
'68 GTO - 464 - Ram Air II heads - 236/242 roller - 9.5” TSP converter - Moser 3.55 Truetrac ( build thread | walk around)
'74 Ventura 350
'69 AMC Javelin SST
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