I have an 84 GMC that the 700R4 went out of and it has a 305 in it that has NO power whatsoever, but starts good, etc. Ive heard that there is a replacement cam "350" that completely wakes these engines up or is that BS? I also have an older stock 350 engine from the mid 70's sitting here, but it would need new gaskets, cam, oil pump/etc before I put it in. Should I leave the 305 in there and change cams or fix up the 350 economically and put that it in? Since Im pulling the tranny out I might as well do something with it. Thanks!