well, my experience with turbos is that compression has to be lowered to somewhere around about 7.5 / 8.0 :1 to make room for more air gas mix in the cylinder and also depending on how much pressure you plan on boosting copper ring head gasket to prevent blow out of head gasket, I believe no more than 3 / 6 psi boost - also consider this piston ring blow by (use chrome moly rings) with minimum clearances for rings to cylinder wall and stress on the reciprocating mass of crank and rod. (Shot peened k361 rod- balanced rod / crank assy.) now for the carburation would you force air into carb or siphon it like a draw thru system. (Definitely a different carb is needed to deliver the cfm and adjustability of fuel metering and jet sizing!) all these questions have to be answered and addressed before starting to make sure the engine is up to the task of the increased loads, however what a cool project I would love to see this come to be! and also consider the fuel type propane is a great complement to turbocharging due to its low temp. for instantaneous vaporization is at 40degrees F. this means that you don't have to worry about fuel puddling as it converts from liquid to atomize to vaporize to be compressed and burnt, the turbos compressed air temp will vaporize the propane for you, for cold weather start up a simple heater element in the gas stream of 40/50degrees F. will pre heat the gas then the hot turbo air will take over after that start up. Also, LP gas emits oxygen as a byproduct so it environmentally friendly. all this from having had worked on turbo automobiles and aircraft for a living. another turbo option is the air research TO3 used on most 2.2L 4cyls. or smaller 4cyls. of the mid 1980's I also just thought of this also, a remote oil tank, oil pump with independent electrical switch ology that will allow for prestart priming of the turbo before running the engine, and oil cooling system is all required for the turbo or else 2 minutes in to the first start and bye bye turbo! I have some old tech data around here if I can find it, talks about turbo, alternate fuel and super charging, I will do my best to find and post but it may take me a bit to dig up the old library. hope I did not blow this out of the water with all the talk, but I hope to be able to offer some insight to what you might be getting into and hopefully you do this because I would love to see such an engine on a GT.