ide get a OBD1 aba bottom end (from a 93-95 mk3 2l), keep your head and trans and get carbs and a cam. relativly cheap (depending on how crazy you get with it), fast, loud, tunable and super fun.
N/A all day, you have the perfect head (JH) and trans (hopefully)... to determine what type of transmission you have, look at the numbers stamped on the bottom of the bell housing next to the oil pan. The first two or three digits indicate the transmission type, with the final five digits giving the date of manufacture in the format of DDMMY. an example is 4K17083. This signifies its a GTI "4K" transmission with a manufactured date of August 17,1983, with the 8 in 1980 implied. you can have one of a number of differnt trannys vw made and threw into thier cars, some have kick ass ratios, others do not. you can find these numbers in alot of places, or just post your code and ill get the ratios for you...
i dont like turbos (unless they are on 16v's) and superchargers are only redaly avail for VR's and swapping one of them in a mk1 is a waste of time and money...these are motor sport cars in my eyes, not retarded unbalenced cars going down a drag strip..
keep it fun, keep it OG.... Build that 1.8 on some carbs or ITBs and have fun