I have a 94 12 valve 5 speed hc1 turbo I have the wastgate welded shut turbo exhaust elbow,5in turbo back, intake manifold, s&b intake, fuel plate ground down and slid ahead. 3k gov springs,60 lbs valve springs. Kdp done, needs a clutch, i have the 5th gear nut lock spacer

 

Studs would be a good insurance policy ... no use in poping a HG if its not necessary .. LOL..

Might even think about getting a S300 (62/65/14) .. nice turbo , spools great, good air and will beat the pants off that Hc1 all dang day .. you might enjoy driving a BUNCH more !!!!

 

Switch to a 4 gsk, delivery valves, head studs, timing, and turbo. Then maybe injectors. Depending how far you wanna go