I've built plenty of budget street .070" 383s using these or similar for my customers, the deck height is almost identical to the 68-69 383. At one time I had a barrel full of stock standard 72 440 style pistons and found a good use for them. https://www.summitracing.com/parts/slp-424np?rrec=true a .040" over makes a budget .020" 400.