what about a 383 stroker??

The 383 will make a nice motor as a 431. It would cost the same to make a 451 out of a 400. You can still get those blocks pretty cheap.The real cost comes after the kit. Boring which is .035 over bore. I wouldnt go the max as you wont have anything to work with later. Line honing milling the block, head work and so on. It will be probably $5000 plus to get an A1 job done that will last. You can also have as much power as your wallet can afford from either eng combonation. Displacment is ussualy cheaper than trick parts to make small motors fast. But you can't spin lots of weight fast so decide what you are going to do with it then figure how much it will take in $ to have it live doing what you want with it to do. You can build a cheap fast motor but it will expire fast also. I currently have a 451 stroker aprox. 550 hoarse in a 64 Valiant best time is 10.72 at 122.65 MPH with a 1.42 second sixty foot. Runs like **** on the street. But its fast