A "true" street hemi torque converter has quite a few differences than a run of the mill wide ring gear TF8 converter. They are high stall and utilize the larger mounting bolts. But additionally, and this is VERY important, the back cover is dished to accomodate the larger bolts(and diameter) of the 8 bolt crank. You can use a "conventional" 727 high stall converter core, but you will need to use wafer thin flexplate bolts as to not interfere(contact) the converter back cover. Many converter companies like Dacco have referred to a wide ring gear, neutral balance, high stall converter as a "hemi" converter in the generic sense, but unless they are using an actual street hemi core it isn't a true hemi converter.

I have a few originals at the shop. I could possibly photograph if someone needed to see it.

MB