There is a man called Humbernut who writes in the Real Classic mag who has built up engines for, and owns two OHC Humbers, along with a couple of Side Vale Humbers and one OHV humber. If you contact me off board with your email address I will pass his email address on to you and also let him know you are contacting him ( if you want to) so that your mail doesn't get filltered out in his spam.
Joe.