[SixtySixDeuce]

The short answer is no. 361, 383 and 400 are B blocks, 426 MW and 440 are RB blocks. 383 and 400 heads interchange, but it would be akin to puttin 318 heads on a 360 or vise-versa. The smaller chambers of 318 heads (higher compression) is negated by the smaller ports. In the case of 360, the reverse is true; the ports flow much better, but the combustion chambers are much larger than 318 and will drop compression on the 318. It ends up being a wash, performance-wise.

If it is a 400 you're building (correct?), and trying to do so on a budget, your best bet is to hone it and drop in some speed pro or KB hypers and just port the heads you have. Swapping cranks, decking blocks, milling manifolds and heads and all the other things that go into strokers and the like gets expensive quick. Shoot, just building Mopars gets expensive quick. The cost of building moderate street engines seems to run right about $10 or $12 per horsepower. Sometimes I wish I was a Chevy guy.