Those PR cars a crazy...lol I havent seen them run in person but there's a bunch of guys around me that run them and a couple of locals consider their cars the fastest around. Note I dont... but they do...lol. However, building a Japanese engine for a turbo is SIMPLE compared to the old V8s. What I would suggest is you get used to spending or at least listening. You're familiar with stand alone EFi. So why on earth would you want to risk a build with a blow thru setup? A blow thru at low boost with no IC is a PITA to get right. The IC makes it much harder. I've worked with Procharged blow thrus and as soon as the IC was added the fuel curve went out of the range of the carb's ability to work. If MS isnt you're cup of tea, why not use one setup you are familiar with? 8cyl vs 4cyl should be a simple click on the mouse for it. On the pistons... You wont find cheap 383 pistons. It's known as the step-child of mopar and as such they dont support it well. I would suggest you plan to spend the cash on good forged pistons and better rods. As for the block prep... main caps, studs, and a girdle are what I'd do on a 383. The 400 I wouldnt use the girdle as the block is much stronger where it needs to be. You make power with a turbo on boost, and you need room for that boost. So I'd be looking at a custom blower piston around 8:1 with the rings moved down a little to keep the heat away. I'd run gapless rings on it and it should be a custom cam. You'll want to contact Bullet or Scott Brown on that. At least that's who I'd talk to. In any event, with the IC plumbing, exh header/manifolding, and various engine parts saying "cheap" and "turbo" with V8 is almost a joke. A cheap V8 turbo that runs well still costs a ton compared to those little buzz bombs.