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.