Sounds like you're doing a lot of thibgs right.... You should end up with a car that makes about 350 horsepower at 15 pounds of boost. That boost figure is low enough to allow you to run stock, cast pistons if you never take the boost any higher.... and, that will save you about $1,100.00 for pistons and rods, initially. your car should have a portred head with big valves (1.75" X 1.5") and with those parameters, Should run somewhere in the 12-second range... fast-enough to run away and hide from a 340 (stock) Duster...
The trouble with this plan is..... boost IS addictive, and you will find yourself wantng more, later.... more horsepower, more performanCe, more "grunt," eventually.
With the cast pistons, you can't have it. It is an invitation to a blown (up) motor, unless you opt for forged (Wiseco) pistons and (K-1) rods right now, in the building stage.
Biting the bullet and buying the good stuff now, will allow you to make up to 500 horsepower, later, with some degree of reliability. A friend has a '70 Dart with just such a 225 motor, and at 28 pounds of boost (!) he runs 11-flat at a little over 120 mph in the quarter... with a 2.76 rear gear. Here is a video of his car: [ame="[MEDIA=youtube]EAxRmoDgsdY[/MEDIA]"]Turbo charged Slant 6 11.02 @ 120.56 - YouTube[/ame]
Think twice before you build the short block...
