1965 to 1979 is the same.
The 1975 regular Beetle windshield will fit the 1971 Super Beetle.
front, no. the front valance is different and the headlamps are different. back, yes.
People have done it but it's very hard. What WILL fit on your Beetle are the disc brakes from a 1969-on Karmann Ghia.
Yes, the hoods from 1968 to 1979 will all interchange.
No,71 and 72 superbeetle hoods are longer than 73 and later,that have round windshield and 71 and 72 have flat windshield,by the way the hood is longer than 73 and later.
No. The Supers were slightly longer to pass the US DOT collision regs.
1974 was the first year of energy absorbing Beetle bumpers. You can't use earlier bumpers on 1974s.
Yup. It'll go right in, no modifications required.
No, the hood will not fit. 1965 is pre-Super Beetle; 1973 is post Super Beetle. The 65 hood is going to be much more narrow and arched then a Super Beetle hood or anything past their early transitions to the Super beetle which started to transpire in June of 1971
No.
a 912 Porsche engine will fit in a beetle
Not without a huge amount of work. Until 1968 VW used swing arm rear suspension. In 1969 they changed to Independent Rear Suspension, with CV joints.