73-80,4x4 tunnel, tips

[madcow75]

I am looking for some opinions from the 67-72,,73-80,,and the 81-87(91) 4x4 cab owners. I have a 1976 C30 doing a 4x4 conversion so I am putting in the tranny high tunnnel in my 2wd cab. My question is should I weld in my bolt in tunnel like the 81-91 cab tunnels are. I am thinking of doing this for cab strength. Would it be recommended to make it solid. I am also running a manual tranny, for now it will be a sm465. How many times do you manual tranny guys really take the tunnel off, that I should leave it a bolt in? The whole in the floor seems to me like it would be a weak point in the cab. I have been told many guys have folded up cabs with the gapping hole in the floor. Just looking for some opinions of experienced owners.