stock 85 H.O 302 210HP stock.. upgraded to heddman headers and full flowmaster exhaust american thunder i think it was... now putting on a performer RPM intake... i'm guessing a 600cfm will work fine for it cause thats whats coming with the intake...

is a 600 going to be good enough? still has the stock heads and cam

A 600 is fine. What type of carb is it? I am running a 600, on a otherwise stock 302 and its more than enough. Was this an EFI motor originally, if so, why ditch it?

85 was the transition year for the musatng atleast carb engine got 210HP EFI got 170HP

this is the carbed engine... with the 5 speed

its a holley 600 thats coming with the intake...

'85 was a fine year for the GT. I'd go either 600 vac. sec. like stock or 650 DP for a little more oomph. That motor will take it.