Looking at the summit page for that cam, they recommend the comp 995 spring.
What rear gear and transmission are you using? The duration @.050 for that cam is 230/236, which is fairly radical for a 326
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66 GTO, 495, M22, Strange S-60 w/4.10
Sold new at Royal Pontiac (Dealer# 07-679)
70 Formula 400/auto
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