The usual offset grind for the 292 rod increases engine size by 4.76% (235 becomes 246.7"). Depending on what you can do yourself and where you live, it may cost $75 per inch gained (and $150 per HP). You certainly won't get 12 hp (1 HP per inch) back.
The remainder of the reported size change is due to:
1. using a 261
2. boring it to .090" (Cadillac + .040" used in the stroker)
Those choices alone (with stock stroke) are far more valuable: 273.6".
