Re: Need engine building info & advice-4.2L
I just finished a rebuild on my 4.2 this summer. I had the machine shop order quality parts they cost me about 500 and the machining cost me about another 500. I would definitely go with 4.0 head before any other engine mods. Besides for MPI, what else will give you 40hp!? Not headers. If you want a cheap carb until you get MPI you may try to Rochester I've been very happy with mine, it costs less than half as much as a Weber and you will get much better performance than with any carter.
When in doubt, whip it out.