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He probably "built" his own high stall converter. He would never pay the money for a quality converter like a PTC and I doubt he has any car "buddies" with one so like many other topics, he has no clue what he's talking about here either.
Since the OP has that 2800rpm stall converter, he might as well try it first. But, he may find it's not great unless it's a higher quality unit.
PTC was a great deal
It is a 10 inch
Anti ballooning
It has SBC lug location
It is lock up
And it stalls as it should
Fantastic education you all are contributing to here, thank you! Yes, I'm going to try the 2800 I have; its the entry level one from Transmission Specialties out of PA (Aston PA, which is the Philadelphia area). This thread has removed all my concerns about the 2800 being too high (as a side note, I bought this tc used, it came with the 700r4. The specs on it are 12inch, 2400-2800 stall.) For now, all the engine bay/heatshield/radiator/700r4 swap/harness upgrades/vacuum redo/, etc have taken their toll on the overall budget. But when I replenish, I'm can without hesitation upgrade to a 3200 stall. So thankyou! I have a plan and will report back on the results.