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Contact AST UK
+44 (0) 1761 439 098
or
info@ast-suspension.co.uk
Ask to speak to Simon Joy and say I sent you. He will go through all the options available to you and what will suit your needs the best.. and give you a great price if you go ahead with them :)
As above welding just never holds.
Bolt in renfort plate if your box is a good one. If not buy a 182 gearbox as they already have a bolt in instead of the circlip.
It's a lot easier to make a modern head flow worse than better imo.
Personally I'd just pay someone to do the head with a proper bench flow test etc and rebuild the easier bits myself like supertech valves, cams and whatever parts you want to fit..