My 517 @ 10.8:1 has a very similar cam/head/intake package and had power peaks of 4300 TQ and 5900 HP. It will pull past 6000 easily. It idles at 800 in gear with a 4000 stall converter. 3.42 gears are plenty so your 3.55’s should work well. With the bigger engine in your lighter car you could probably gear it up some and not loose any performance.
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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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