Since you already have the head sitting on the Bridgeport table, no sense to even consider welding. Get a good setup first, with the head clamped down at the correct angle and parallel to the table. I think I would then start off as someone else suggested and indicate the center of the port to the left, then find the distance to the center of the threaded holes for that port. Then move over and find center of the end port, and move out the thread centers. I would first spot face the bolts with a 2 flute endmill a little smaller than the minor dia. of the thread, so you can drill into a flat surface. Then center drill, then follow that with an 1/8" drill, then drill with a bit 1/32" smaller than tap drill size, then tap drill size if it still hasn't started to turn.
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Today's Featured Article - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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