73-87 Converting a cab from low to high hump

[Tx Firefighter]

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I have an 85 model low hump cab and have a line on a 78 model SM465 4 speed transmission and the bolt in high hump floor from the same truck. Thing is, I don't have a way to put hands on it right now and see for sure.

My question is, will the high hump cover drop into place if I cut the hole and make arrangements for the hold down bolts ?

This may seem a stupid question, but I know from first hand experience that 60-66 trucks have a different firewall and require a good bit of modding to make it work when swapping low to high. I further know that 67-72 trucks, it's just cut the hole and bolt the hump in place. But, I've never done this on a 73-87 and my current cab is finished to near show quality. If it requires more than cutting a hole and some weld nuts I won't mess with it.

Thank you,
Kevin