Depends on what the base circle of the flat tappet cam is more than anything. I'm going to guess that right around 6.25" long pushrod will get you close. I've got some 6.15" and 6.50" for sale off my website. THe 6.15 were on my GT-40P combination but the heads were milled about .140". The 6.50" come from TW head setup.
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Jeff Chambers
1990 Mustang GT 10.032 Seconds / 137.5 MPH
14-time Street Warrior World Record Setter
CRT Performance
2001 Tropic Green Mustang GT - 12.181 / 113.2 MPH
2002 Ford F-250 Crew Cab 7.3l Power Stroke - 17.41@77.2
"There's nothing boring about a small block automatic shifting gears at 9400 rpm!"
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