I have a Torker with a Holley 600cfm with 2 gaskets and and it does raise the cover a bit, approx 1/8". I installed a new 770cfm and the choke linkage hit the manifold when the throttle was opened past half way. I ground down the portion to clear. So be careful your throttle could stick open. I have put the 600 back on, it seemed that the 770 was a bit too large for a stock 351c. I'll save it for the rebuild or mess with the jets.
curt
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