Hi Alexander,
 AB> A Beaumant is basically, from the frame, and cowl back a Chevelle.
 AB> It has "Pontiac" front fenders, hood, and type typical Pontiac
 AB> split grille.
Sounds like the Tempest we had down here. Available in different "trim" 
versions though, standard, Le Mans, GTO.
 AB> As far as I am aware (I;ve been trying to find information on this,
 AB> since it looks like an intriguing swap for the regular I6) the
 AB> OHC-6 was only available in 68 or 69 (can't remember correctly at
 AB> the moment) and was apparently a high priced option. It could be
 AB> had in (apparently) in the Pontiac line up, including the Firebirds
 AB> and Tempest series.   
It was available from '66 to '69 down here. First at 230 CID, then stroked to 
250 CID in '68.
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