have decided to go with a blown red motor, bought a 186 today, with Duralite pistons, turbo cam, new lifters, rods etc. was running a blower but he killed it so doesnt come with that. but have another one lined up hopefully should have in a month or so.
Whatever you do with it, don't screw this car up. It is too rare and looks bloody excellent as it is. Your mods so far have been intelligent and appropriate. Put a blower on if you must, and by all means fit a worked 186, but remember that LC Toranas were build long before Holden discovered that cars should handle and stop properly. If you are going to boost the power, make sure the suspension and brakes are as good as you can get them. Even if the car is comparitively low mileage, the suspension bushes will probably be the originals which means they are 40 years old and well overdue for replacement. Same thing applies to the shocks, steering connecting rubber bush and possibly hydraulics.
yea it wont be going that fast, but have yet to do the shocks, springs, brakes etc and i will eventually get all new nolathane bushes. i want to keep it clean and original as i can, as u said they are getting harder to get and more expensive, and i plan to keep this one in the family.
SU's have arrived and am waiting to get some $$ to buy rollers and, an XU-1 style cam but better using my uncles custom grind to replace the Turbo cam thats in it atm. then once i get around to building it and gettin it prepped to go in, it should be still pretty quick but more tame than supercharged.