Compression Ratio and Boost Query

I agree with you in regards to the budget factor. As a matter of fact: That is what has lead me to this build.
Backstory: I was building a parts grabber/daily Dakota pickup and I was gonna do an n/a LA build. My base ended up having a cracked magnum block at the freeze plug. Where I am at a junkyard V8 costs $375 you pull-it. Late model or not. There was no point in pulling/building a magnum 360 when I could pull a Gen III hemi with WAY better heads/architecture for the same price. Total build was 7K. For essentially a new truck. Rebuilt engine/trans/rear/suspension.

So.. my daily is pushing over 400hp at the crank. Its got 4.56 gears, a shift-kitted 42RE (yes.. its fine @ 400hp) and is easily a mid 13 second truck even with traction limitations. I don’t really need a ‘dependable’ hotrod at this point. As a result of the u-turn on the Dakota, I am left with a pile of LA parts, and a suitable chassis that was on the back burner.

So… the stuff below is essentially $0 at this point.

What I have:

1966 Plymouth Valiant Signet 2 Door sport top, mini-tubbed, springs relocated under frame, firewalled, all undercoat removed

Narrowed 8 3/4 (489) with 3.91 limited slip.

3000 lb super stock springs

318 Block .040 over, casting flash removed, bulkheads saddle cut and chamfered

Bushed heavy duty 360 rods with pin oil holes added. Casting ribs removed and balanced. HD rod bolts

Cast 318 crank. Really straight. (.000750 @#3 .002 @ 1+5)

Magnum 318 truck heads - stock. 58cc. Currently at the machine shop. Might be cracked… they usually are.

302 heads. 62cc chambers, some porting, 2.02/1.60 valves, bronze guides. 340 (red) mopar springs.

273 shaft rockers with banana groove shafts. (Clearanced a bit for bigger springs)

KB 167 Pistons .012” (below deck)

Mighty Demon 650 mechanical with annular boosters (probably too small for this..)

Edelbrock performer RPM LA intake

1973 A904. I will rebuild this. Probably go bolt in sprag and full manual.

I have way more LA crap lying around. Thats just what I plan on potentially using.

Like I said: I really don’t feel like building another 400hp n/a motor, nor do I feel like building another GEN 3 Hemi to boost.

Yes. The cast crank and A904 are very questionable @500hp+. However, people said a 42re can’t live over 350hp and I can tell you thats not true. I agree It would likely be different/blown if it were a track build.

The bore edges are a great point. I had not considered that.

My point is: I don’t care so much if it blows up. I want to see how much I can make with a single turbo blow-through setup.

I also realize that 14psi on a 2.0 liter engine is around 200hp, and 14psi on a 5.3 liter engine is like 600hp. Thats a big difference as far as stress on internals. Although.. the 2.0l 4G63T is all forged and can live (mostly) dependably @ 500hp with stock internals.