stop it worty my heart was racing after reading the first bit
Heh, sorry mate!!
Rest assured, even if the motor did self destruct, I would NEVER 'blame' you or anything close. I know how much work you and MWAS put into it, and I 100% respect the skills you both have.
If it did blow up, it'll either be my fault or the engine has genuinely reached the end of its serviceable life. I reckon you and your brother have given it the best chance possible of surviving, so I'm happy either way.
Having said that, I won't be rebuilding the engine if it did fail badly. I would probably salvage what I could, flog the rest for bits and pieces, and seek a decent, complete motor (or something like that anyway).
Have some B&Ts and relax! All is good in the world (except the weather)