t-body -- if you already have a 65 or 70, keep it. Like everything else it's a trade-off, the 70 should give you a car length or two, the 65 will have better throttle response on the street (less of an on/off switch, if you like corner carving).
MAF -- with no eec tuning, go with the Pro-M 77, the Univer, or maybe the 80mm bullet if funds don't permit those more expensive meters. The C&Ls seem to be hit or miss usually miss, on the 42# cal. If you will be chipping or doing other eec-tuning, go with the 90mm Lightning meter or the Univer if going blow-thru. NOTE: the Lightning meter will not work as a simple bolt-on with the 42# injectors, you must enter the Lightning MAF transfer curve into the eec.
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