how much of the tunnel do I cut and raise-1967 camaro with TR6060

[Bullrider]

Looking for advice before we cut our tunnel-my son and I are building a ‘67 camaro using a DSE subframe with a LS3/TR6060 and we modified a transmission crossmember since nobody makes one for this combo. We have the tranny angled down 3 degrees and the front half of the tunnel will have to be raised at least 2-3” to clear. My question is the driveshaft-since I have lowered the rear end, and my tranny is a little high, will I need to raise the back half of the tunnel so the driveshaft will have plenty of clearance? I plan on bolting in the subframe and then ordering the driveshaft so I can see the clearance but wanted to see if anyone else ran into this situation.