Im gonna tackle tuning a 3310 with an O2 sensor....Need to get it as lean as it will allow at cruise

I plan on either drilling/tapping the PVCRs on the primary side or getting an aftermarket front block that is tuneable on the PVCRs...

But, Im not sure whether to get a tuneable rear metering block or use one of the plates like QF sells that allows jets to be used??


72 RR, Pump gas 440, 452s, 3800 lbs, Corked, ET Radials,. 11.33@117.72. Same car, bone stock 346s, 9.5 comp, baby solid. 12.24@110.