I have been looking for one for my 70 for almost a year. Read on A bodies only that they are really rare to come by. When searching around the big block ones are fairly common. My only caveat is for a 70, AC, w/o PS, not sure how that plays out with your 74.
Looks sharp! Unfortunately these stories from the auctions seem to be more and more frequent. Not sure what you paid for it or your skill level, but a lot of the items you say are wrong can cost some $$ to fix. Maybe need to get a list of what you think needs to be done, determine some prices...
That was my concern...from the expansion to the dryer that hose appears to be incorrect but aftermarket hose is available to correct to the fittings change.
The other question can the larger lines be mad to work. 1970 lines appear to be very hard to find also along with not knowing if there is...