Looking at this...Engine is 408ci. eagle crank and rods, kb hyper pistons, comp cam hydraulic roller xr-292hr-10 duration 242/248 lift .545, 1.6 ratio rockers, edlebrock rpm heads, airgap intake, and 750 Holley dp. Car is consistently 12.20-12.30 @108-110mph.

You have a very very mild entry level cookie cutter stroker, your 2.08 heads are probably not helping you yet.


So you have a mild motor that happens to have a 4 inch crack, a much lesser motor as you found can easily equal that.

Id start at the big red flag to me and dump the hydro roller cam for a better "performance" cam, turn up the rpms to use the heads you have.

But as many has mentioned, when you start down the faster road, how fast is fast enough for you and how often do you like to drive the car?