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Eljaro
Regarding the pushrods hitting the manifold. Your problem is common. The intake valve lifter is offset towards the center of the intake port and this causes the pushrods to set at an angle through the pushrod hole in the intake manifold. I had the same problem but on the other side of the pushrod hole. This is because I used offset roller lifters and .125" offset roller rockers. This caused my pushrods to hit the outside of the hole. Here is a recommendation to eliminate this problem.
1. Drill out the pushrod hole to .875"
2. Press into hole holes a plug that creates a .002" interference fit. (Before doing so coat the plug and hole with a good high temp. epoxy like JB weld)
3. Allow a day for the epoxy to dry.
4. Assemble the manifold to the engine.
5. Using all thread make a pointed end and thread into each rocker arm until the point makes contact with the plug. (You may have to adjust the rocker height in order to get the pointer to hit the plug in the center. I am talking about the center based on the distance from the intake to head mating surface and not the side to side center.)
6. Punch a mark where the pointed makes contact with the plug. This will be the correct side to side location your pushrod will need to be in.
7. Drill a .625" hole for each punch mark and your done.
No welding is needed.
Another possible cause is your pushrod cup / adjusting ball may not be getting enough lubricant and galling then braking. Check to see if there is blueing in the cups.
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