I would spend some more time tuning before tearing out the cam. It’s going to be a bit choppy in a 400 and probably need some richening of the carbs’ idle feed circuit to get it drive good down low but it’s really not that radical.
Double,triple, and quadruple check firing order, especially #5 . It’s easy to swap those 2 and the car will run but pop out of the carb at low speeds. Not that I’ve ever done that.
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68 GTO,3860#
Stock Original 400/M-20 Muncie,3.55’s
13.86 @ 100
Old combo:
462 10.75 CR,,SD 330CFM Round Port E's,Old Faithful cam,Jim Hand Continental,3.42's.
1968 Pontiac GTO : 11.114 @ 120.130 MPH
New combo:
517 MR-1,10.8 CR,SD 350CFM E's,QFT 950/Northwind,246/252 HR,9.5” 4000 stall,3.42's
636HP/654TQ
1.452 10.603 @ 125.09
http://www.dragtimes.com/Pontiac-GTO...lip-31594.html
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