Not my sales thread but thought I might help out.  Most of the time those motors run a Tilton 7.25 triple disc clutch.  Can find them used and in good shape for $200-$300.  Bell housing is for Muncie or Super T-10 style bolt pattern.  Most would run a Jerico/Tex 101 style dog ring 4 speed.  $1700 to $2800 rebuilt with shifter.  I think a TKO 5 speed has the same bolt pattern but doubt it would handle the HP. 
 
Would not use mild and this motor in the same sentence.  With 10:1 compression is will still make 675-700 hp at close to 9000 rpm with that short stroke.  Bump the compression to 12:1, and as Ron Sutton stated, 850 hp motor. 
 
I was going to put one of these in a 70 Cuda.
		 
		
		
		
		
		
		
		
		
	
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