At a minimum you must loosen the motor mounts, trans mounts, & exhaust pipes and raise the engine high enonugh to get the pan off. You will most likely have to remove the dist. to get the lift you need.
This topic has been raised many times before. Some will tell you the best way to do the job correctly is to remove the engine. Others will tell you what I stated above.
Many years ago I remember doing this on my 71 396. The car was for sale - no one would buy it with the blower on it so I had to remove the blower and replace the 7:1 Venolia pistons back to the original pistons. I did this with the motor in the car, I don't recall if the trans was out or not this was 20 years ago. Last year I tried to remove the pan on my 70 396 with the motor in, I raised the motor to the highest I could get but could not clear the fly wheel, it was impossible, I wound up pulling the block. Recently I had to remove the pan again, I brought it to my friends shop. He dropped the trans and the pan came off with ease.
It may be easier to drop the trans or just pull the motor out completely.
I dont know about a Velle but I helped a buddy swap to a chrome pan on his truck. PITA to get it on
trying not to mess up the gasket and line up the bolts to get em started
what a pain! It wouldnt have been bad if he had bought pan studs I think....you might try them...think ARP makes them. I think they would make getting the pan on much easier. But it might be pretty hard getting the pan on and off in a car.
Primer black 69 velle (far from done)
my motors done...
iron merlin rec port heads
Compcams promagnum rockers roller cam
.646int.653exst 280/286 w/110separation
RPM airgap eagal rods
ARP bolts and studs
will run an auto
ACES # 04287
I just finished putting a chrome pan on in place of my original, leaking pan. I have a 396 in a '70, and it was a real pain. The manual has specific instructions on how to do this, and only in the 396 (as I remember) did they have some special instructions, I am not sure what would be different for a 454. Anyway, I spent a week trying everything, and once I gave up and disconnected the trans, it was a piece of cake. The distributor, fan/fan clutch and radiator shroud will need to come off, as well as the starter and headers. The manual said to remove the radiator cover so the radiator can "move" a little, and that helped too. Then I pulled the engine up a few inches and the pan dropped right out. But the transmission has to get out of the way or you will never succeed.
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