I have that engine in my 65 FB.
On a dyno jet 382 RWHP and 362 ft.lbs tq. SAE corrected
I am happy as this is a 15% loss thru the drivetrain which is typical for a manual trans.
That is with Holley 750 DP,FPA full length headers magnaflow ss exhaust w/x pipe,G force T5 with a Ford 9".
There are to many varibles
(weight,tires,suspension,driving ability,track prep/cond...etc)to est. E.T.
Scott