"451 Manifesto"

The 383 on my stand is going 489". 4.25 stroke, B wedge rod. This is to be a low rpm torquey street engine as the 383 is just shy of 500hp. It has a higher rpm requirement and peaky power curves and the owner wants to be more drive-able.

In terms of budget - if you're starting with a known good (sonic tested, magged, etc)core block and expecting 500-550hp - I budget about $18/hp, not including dyno time if you want it. Somewhere around $9500 give or take. 400-500hp about $15/hp.

This 489 project has an assumed-ok 80% machined block, he got a screaming deal on some heads, and he's got the intake carb, etc. so it will end up being about $4K to convert it.