Exhaust manifolds

[feller]

Ok I have used search box.
My question: how or where would the factory rams horns dump on a 72 with 350? I ask because truck was originally a straight 6 that the p.o. converted with headers and they hang way to low and I have a set of rams horns but unsure what the came off of. They both have about a 45° angle to the rear, basically need to know if an off the shelf exhaust system will work or am I going to have to take it to a shop and wait, and if so is it safe to drive it the 15 miles or so to said shop or am I going to need to borrow a trailer. Thanks guys