Wheather you have to drill holes or not depends on whose motor mounts you are using but it's not too hard to drill new holes if you need to. If someone had a th350 in it at one time and you go with the 4l60E and Tejas mounts I think it works out that the mounts slide the motor forward enough to where if you had the th350 the 4l60E now bolts in it's place, but it sounds like you will already have multiple holes in it, so you might just check the furthest forward set of holes. If you have 4 sets of holes and still need to drill some you might want to either weld up the old holes or lay some 1/8 plate on the top side of the bottom rail just to help offset the missing metal. Might be overkill though.
Im not swapping at this time. I am only replacing the "oem" one since it is mangled and wasnt bolted correctly. So it was a 305/350 truck. It has a 1973 350 and a 700r4 whose rebuild date, if thats the date written in tamper proof marker, was 2014. But ***** not right with it.
Whats going in is an 87+ TBI motor with a carb intake and having the 700r4 rebuilt and put back in.
This is what my transmission cross member looks like. I dont know how it was supposed to be bolted but I marked up how it was bolted and I pulled off. And note, this one is at least 3x better looking than mine.
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