75 would have 4-1/2 lug pattern so the wheels interchange with full size Chrysler and also with Jeeps. There are lots of decently wide aluminum wheels on Jeeps so you might want to start looking there. It would have been a 318 car as the only 360s were police package, so rare as to be non existent and they didn't come in SE. It'll have a 2.45 gear 8-1/4 axle which works well with the 360. Front brakes are the same discs used with Hemis in B bodies so they're adequate. About the only chassis mods it would like are large antiroll ("sway") bars front and rear. 73 bumpers fit the body better if you can locate a pair of them. Power seats from a later Diplomat or 5th Avenue are bolt ins and are much more comfortable than the stock SE buckets. Putting the battery in the truck helps handling and so does aligning it with about 1/8 degree negative camber, all the caster you can get and 0 toe in.