the type-r and b16 heads i beleive are identical to each other... b16 vtech also has the PR3 Vtec Head, tho my b16a3 Del sol head code is PR3-3, tho i have to re-check, could be wrong but there is codes on head that can be PR3-1, PR3-2, PR3-3 ETC.
so yes i do believe that it is a type r head...