A combo I used about 10yrs ago would net you well over 400rwhp with alky
TRW forged pistons, rest of bottom end stock, mild ported heads, 210-205 flat tappet cam, PT-54 turbo (better turbos available today) 3 in Dp, 2800 converter and a modified neck intercooler. I used to run 11.50's on alky