to me the tbi 4.3 was the good one and the sfi one was junk. It was actually somewhat hard to find a motor locally because most had spun bearings like mine.
The one I ended up with burned oil.
My motor was junk at 123k.
I have had
FOUR vehicles with the 4.3 Chevy engines...
Three of them in Astro Vans and one in a long wheelbase, full size van...
Me and my guys, put a combined total over a half million miles on the three Astro Vans.
Never had any engine trouble with any of them.
The full size van, I sold to my brother a couple of months ago.
It has over 100,000 on it and has never had to be in the shop at all.... for
"ANYTHING"...
Maybe I just got lucky...