I choose the 13t because i found it at a local import yard in a shed with papers and it had 4,000 kms on it so i popped it apart and sure enough all new inside with paint markings on the spings still and super clean inside. i should have mentioned it now has a non gay shaved 2T bigport head on it instead of the original 13t and 3t pistons to suit... well now i don't have to i guess. i love the sound of the old hemi pushrod engines so being the underdog i am that is what i used!
Regards,
Matt