340 with big hopes

..how did you arrive at 450 hp ?
..stock 340's were only 275 hp and were very quick on the street.
If this is for an A body the most economical way would be build it to stock specs with a 650 cfm carb of your choice,recurve the distributor add a 3.55 gear and have a converter built for your combo.You will have a little rocket.

..as for digging up an old post don't forget there are 30,000 members.