Darkhorse468

I have two fresh 468's with ALL the goodies and 9.75-1 comp. MSD ign., CMI headers(the real kind...with long tube collectors to boot) etc., etc. The four corner idle is new territory for me as well as the extreme height of the carb on the Merlin Dominator flange intakes. What is a good base line for an idle...these were already jetted and set-up for 510 600hps so their close. Also what kind of plug and heat range.