Lets have some fun!

Do you have any idea what you have now, as far as compresion, heads, cam, etc?
If you have a sound short block in there now, why not just add some decent heads, cam, intake, etc.

My old 340 in my Dart Sport was just a stock rebuilt 70 340 with some 915 "J" heads I ported at home, MP 557 solid, M1 intake, 727 auto, 4.10's in a 8 3/4". My best run in the 1/8th mile was a 7.49 @ 89--11.90 @ 110 1/4 mile.

I just depends how much money you want to spend!