Hank,
Too close to call btwn the 390H and 450H in Gtech times, they each "won" a couple times. So again I'd say, whichever one U get a good deal on is the winner. Driveability, 390H seemed a bit snappier but that was just a "Feel". Just too close to call.

 Originally Posted By: Mean buzzen half dozen A.K.A. Hank
Thanks Tlowe & DeuceCoupe,

DeuceCoupe, between the Holley 390 & 450, the 390 worked a hair better?
How about driveability? Both about the same?

I ran on my 250 6 cyl an old Carter 400 CFM AFB, 1965 273 V-8 era & it ran really good w/that. I did do a little tweaking to it though.

Thanks

MBHD