Mine & yours are very similar, 440 Source kit, I had the machine shop check everything throughly & they found no real issues, the rear main seal surface needed polishing & the snout to damper fit needed tweaking... I have the 17cc dish pistons, 84cc Edelbrocks, MSD Pro Billet, Performer RPM, a Holley 830DP It should be a very docile street motor but still able to scare the crap outta me...