This engine has a stock bottom end, maybe low compression, don't know since it had a rebuild sometime in it's life. Edelbrock heads with roller rockers and an Air Gap intake with Street Demon 750 cfm. It has TTI 1-3/4" step headers to 3" collector. TCI 3K converter and a TCI 727. 8-3/4 rear with 391's in a 2 case. What's the best cam for this combo?