What part of the country are you in? Do you run at higher elevations?
It seems like you’re down on power a little. Should be able to turn over 100mph with that combo. Before you spend money you might not have to, make sure you have full throttle. Also get softer springs for the vacuum pod on the Holley 750 and see if opening the secondaries sooner helps. And check fuel delivery like mentioned above.
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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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