Hello , i have a rebuilt 355 cid , flat top pistons whith 041 heads about 9.8 - 10.1 comp/ratio comp 280/480 hyd cam , eddy performer rpm intake, headers and a holley 600. the 600cfm needs rebuilt .would a holley 650 cfm vac sec or the 670 cfm vac sec holley avenger carb be better or just rebuild the 600 ? also electric or man choke ? its a daily driver but very little highway. Also whats a good plug to run with the 041S ? thanks for the help. Terry