Sorry for my absence I was really busy doing some inspection offshore
Holley 650 cfm carb already in place and the result was great
I have changed ring and pinion from 2.56 : 1 to 3.73 : 1 and it didnít work because of the gear box ratio so I change it to 3.07 good acceleration and good top speed
I have used the ring and pinion from a 1974 buik century auto trany whit good gears .
Now im going to do some modifications on the 305 cylinder head :
Port to 1.94
Upgrading the cooling water ports
Also im going to put 1.6 ratio rocker arms and I need some advice to choose the correct rocker arm brand and material .
Cam shaft already selected and it will have Advertised Duration 285/295, Lift .470/.470 and I hope the combination works well .
One more thing that I need your advise :
My mechanic told me when I ran holley carb I must change the stock fuel pump and use electric fuel pump,
is it true ????