Two biggest issues are starter and oil pump clearance if the car was originally built for a SBC. The starter, at the 9:00 position is right in the middle of the motorplate upright, unless the chassis was built extra wide to start with. Usually the upright at front motor mount will be an issue, most chassis builders will place a diagonal on either side of the pump to form a pocket for the pump to extend through the chassis. Normally FED's use pretty much same motor angle as F/C's and altereds which means a 3x5 funny car pan, about 8 quarts unless you overfill it, an accumulator is nice to have for insurance. You can go with the Chevy position starter on the right side under the pan, bolting directly to the motorplate, although ground clearance will be tight. Best thing you can do is take as many measurements off of the car as you can, and make friends with a good tig welder, just in case you have to move some bars around. Definitely is not just a drop in project, and BJS may have had the best idea, but if your heart is really set on it, it can be done.