look for distress sales, divorce, death and things like that. ya, ya, l know, kinda morbid, but when l went thru my divorce everything went at firesale prices so l knew somone else could get some use out of it and not have to scrap it.
craiglist is a good source, as is going to car shows and asking people who have the style your'e looking for, some times they know of one or two sitting around just waiting for a 2nd chance at life.
have a plan of what ya want, that way ya don't waste time and money on a ''maybe l'll make it work'' just to find out it is not really what ya wanted.
l have done that and it sucks, lost money and had a lot time in it and was sooooooooooo mad at myself
My first suggestion would have been to post this in the "Rat Rod & Hot Rod Talk" forum...but if it were me I would decide what type body I wanted first before I decided about the front end. If you use the Jag front I would get a body with front fenders. I would do a drop axle in front with a square tube frame, truck cab or Model A something or another and leave the engine open.