I just pulled the pump off a 360. It will take me a couple of days to get back to you, but I will find the box I put the bolts in and will be happy to send you the info unless someone else does it before I do.
Hmmm. If memory serves me(questionable) there are 3 bolts that attach the pwr steering pump bracket to the block. I believe they are 3/8" course thread and need to be at LEAST 1" long with 1 1/4" being better. As far as grade I most always go with at least grade 5 but given my choice I use stainless steel.
I'm certain these figures are correct since I just mounted my pwr steering unit today and purchased the bolts for it last night. I bought 1" and decided today during the install that I could have used another 1/4" of thread.
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