Hi; Nice car by the way i didnt notice the pic! I have the exact same one...
Yes i dont think the gasket is related at all its just me buying cheap replacements and fitting them too tight.
Im thinking i may replace the block now aswell when i yank it out for the clutch, belts and spray. Could pop a 2L in there for probably £100...
136ps i think but i guess the extra torque would be worth it.