Check out these alternatives...Dipstick from Audi V6
You can buy two Audi V6 dipsticks and cut the handle off one and the tip off the other and braze or tig weld them together at the correct length.
Thomas Tornblom did this to get a dipstick with an O-ring seal at the handle to avoid any air leaks that upset his EFI.
The dipsticks are dirt cheap, even for being genuine Audi parts. He paid less than $10 apiece. Dipstick from Ford Econoline Van
In the course of doing a 392 Windsor swap in his Pantera, Trevor Fourgere we came across a very nice solution to the Windsor dip stick issue, which may also work for you - although I don't know if the Windsor and Cleveland dipstick holes are the same diameter.
The dipstick and tube that came with the 1990 Ford Econoline Vans that have the 351W engine is a direct fit to Panteras with a Windsor swap.
Ford Motor Company part numbers:
This combination curves back over the block, much like the stock Pantera dipstick tube. A little extra bending and a shortening of the tube and stick by about 6 inches leaves the handle nicely positioned at the rear of the block. The shortening was done at the handle end, thus requiring no modifications at the business end in the timing cover.