I don't think you could make 200bhp with a g40 lader, be it 1272cc, 1341cc or bigger.
Barney's made 194bhp at stealth, and about 187bhp at Aldon I believe. I've never believed Jabba's figures to be quite honest, at work I can give you a dyno print out for an engine that's well under, or well over the odds, all in the correction factor
58mm pulley is asking for trouble IMO especially without a decent map.
Eaton's in my opinion sound annoying! Remember a quick drive in Eekie's car (about 20miles) which was more than enough. For proepr refinement, with reliability turbo is the only way
G60 lader are savage, and will give 220bhp+ on a well specced 1341cc engine, torque delivery is savage, so expect your drivetrain to take a beating- I renew my CV joints every year, I guess a G60'd G40 would need them more regularly.
I think the 8v heads haven't got a huge amount to give after 230bhp anyway, but time will out!