RE: rocker arm comes off at high RPMs
It could be a combination of a lot of things. The hydraulic lash adjuster could be losing pressure at high rpm, the cam could be worn (but you would notice that at low rpm as well), the spring could be weak and floating. I would start at the part that costs the least to replace: the lash adjusters. I picked up a complete set for mine for under $20 new. Rockers are relatively cheap, too. I put a set of roller rockers from a 90 2.5 turbo in mine with the stock cam and it made a difference (cam profile was the same, just the lobe was thinner). Throttle response is a little quicker. As for cams, search the junkyards, you can find some very good cams at some of those places, just make sure you measure the lobes and journals good and check for cracks.
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