Subframe connectors needed or not?

I'm going to install the bolt/weld in type, can't hurt. My current slant six can't twist anything, but I built the rest of the suspension (T-bars, sway bars, shocks, upper/lower control arms, borgeson box, steering arm bearing, 8.75 posi, rear leafs, 15" tires, front power disc brakes, etc.) for an eventual v8 upgrade, this was the only piece I didn't upgrade.
Yes, after chasing out the old body work at the rear quarter seams for the third time in 13 yerars 1984-1997. “70 swinger 340” I said the next one I do WILL have frame connectors. It does and it is definitely is worth it. Bolt in or weld in either will help. No I would not attempt to weld in with carpet/interior in way to much chance for fire .Good luck…Swingn’