Here are some cars with "shoe-horned" engines
Visit the engine tech page and get some tips on these swaps.

Type III Fastback with a 911 six cylinder pic 2 pic 3
Type III with a 911 six cylinder
SuperBeetle Baja with a 911 six cylinder pic 2
SuperBeetle with a 911 six cylinder pic 2
SuperBeetle with a water boxer pic 2 pic 3
Beetle with a water boxer
Old Oval with a water boxer
SuperBeetle with Type IV pic2 pic3
SuperBeetle 'Vert with Type IV
Ghia with a water boxer pic2
Vanagon with Golf A3 2.0 cross-flow head
Vanagon with 911 six cylinder
Vanagon with Audi 5 cylinder
Vanagon Double Cab with 1.6
Vanagon with Subaru DOHC flat 4
Vanagon with VR6 pic 2
Golf I pick-up with 16V pic2
Scirocco I with 16V pic2
Golf I with VR6 (Count the intake runners, there is six!)
Golf I with VR6 pic2 pic3
Vanagon with 4.3 liter Chevy V6*
Beetle with Porsche 911 six cylinder*
Beetle with Mazda rotory*
Vangon with Subaru waterboxer*
Beetle with Subaru waterboxer turbo*
Golf II with VR6 Turbo!! pic2
Golf II with VR6 (has Tech info)

*Used with permission of the Wild VWs webmaster. See links to visit his site.