Looking at shops for a short block. First phase is to upgrade to a 383 short block. I'd like to continue using my current top end components which are stock double hump heads, and an Edelbrock manifold with a 650 cfm carb. Heads have upgraded springs, threaded studs, guides, and roller rockers for use with a Lunati roller cam (.476/.504). Would like compression to be 10.2:1. Future upgrades would be aluminum heads & EFI. I've had conversations with Raptor Engines in Portland, OR. Others I've looked at are CNC Motorsports in SD, Skip White Performance in TN, and CME in SC. Any feedback on these shops? As is typical, I'm on a budget build. Recommendations?