Le Conte du Graal online:

There is a transcription of the Paris MS. at the University of Ottawa:  Le Conte du Graal (Perceval)

At Stanford:

Lecoy's edition (based on the "Guiot" manuscript)  -lines 1-267.
Roach's edition (based on the "T" manuscript)   -lines 1-267.

These in Old French, of course.

Malcolm