I don't know if they do this type of modification work but Roe Engineering in Fleet used to be a good place to visit about 20 years ago - they are the only people who I can think of who are close(ish) to you - perhaps they can help.

Timing chain with a raised deck solution will be interesting.

The main design requirement you need is to work out the effective compression ratio that you are aiming for and then calculate the additional swept volume you need and then remove the area of the bore you have to get the height...

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1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!