Theres an E-mail for this guy at the bottom of this page I posted, Maybe he can steer you to someone, or a car club?
The Old North American cars of the Netherlands
Wezz! even with the older European cars , the Netherlands Mechanics can show you how! or come over for a few bucks to see how your doing and give you a hand! mechanics in your area must be well trained for all vehicles?
Any way: The 7.8s should be ok!!! Cut a chop stick to 7.8 and put it where the push rod goes or something!
You didn't change your cam bearings so a little wear will add some slack to the chain, the more wear a little more slack! post a picture of your chain and the slack you have!