Just because it's a flat window doesn't make it a standard Beetle... does the spare tire lay down flat(super) or does it stand up in the nose(standard). There should be strut towers made into the body sheet metal for a super this would almost(not completely but almost) be impossible to put into a standard body without a complete remake of the front end of the body itself. What it sounds like you have is a first year "1971 Super Beetle" in my opinion this was the best year they were made. On the engines, supers vs standard Bugs they were the same... my "76" standard Beetle came with the same engine that would have been put in a 76 super.
For parts I suggested motorworks because... at least for me, I have never had any problems with them, but there are a lot more vendors with good reputations out there ...CIP1 is good also Airhead parts is another. And for your engine rebuild please please have your Hubby visit this site for their tech info at least if not the parts. http://www.geneberg.com/ Bar none these folks know what they are talking about... Gene Berg was a racer in the sixties that would pull his dragster to the race track with his street Bug then pull the engine from that Bug and put it in the dragster and race! Most of the time he won. Then he would put it back in his street Bug and go home... As I said these folks know what they talk about. Olspeed
66 Ghia 76 std Beetle
It's not a car it's a VolksWagon