The original 250 2V Aussie valve gear is adjustable, and is best replaced by the same ball and cup adjustable valve gear pre 1966 Ford 200, and the right adjustable valve gear 200 pushrod if you are using the stock Aussie rocker cover.
If you use the Fox body or post 1975 rocker cover, the baffles will rub the adjustable rocker gear.
See polished rub marks in the red squares. They have to clear that kind of rocker cover.
If you use your stock non adjustable 200 log head gear, you use the stock ball and ball non adjustable 200 valve gear from any 1967 to 1983 200/3.3.
The two types of pushrods have a nominal length of about 7.975 inches from the mid point of the ball to ball or or mid point of the Cup centre to ball in the case of the adjustables. The way the catalouge pushers measure them differ, ball and ball items from Comp Cams measure 8.350" from the tip to tip, because they add 3/8" for the balls. I always measure center to center.
http://www.compperformancegroupstores.c ... 66Pushrods
The push rods I have are nominal length of about 7.975 to 8.012 (or 202.5 to 203.5 mm in my picture) ball to ball or Cup center to ball in the case of the adjustables.
The rockers wipe a valve which is a little wider than the stock US 200 log head, but as long as the orginal rockers are not worn and still surfaced, everything should be fine.
The original rear rocker tube bolt needs to be clean and able to supply oil.
https://www.fordsix.com/forum/viewtopic ... w=previous
https://www.fordsix.com/forum/viewtopic ... 27#p523527
Its very easy to get confused...the stock pushrods are the same effecive length.
Look at the last two pushrods for comparison. The ball on ball non adjustable is on the bottom.
