You can bench bleed in the car, same principal, just using the brake pedal to move the plunger.
ALSO.... WATCH OUT for squirts of brake fluid. I shot brake fluid 15 feet onto my sisters WHITE 65 mustang and didn't know it till the next day. needless to say the white under the brake fluid was no longer white! still haven't lived that one down!
ALSO ALSO...
Your new master cyl does not have the holes for the bellows to attach to, not sure if you want to drill and tap for it You might be able to use some adhesive to keep it in place. I suspect your new MC has a snap ring to keep the plunger in. If you do decide to drill and tap BE SURE to prevent shavings from entering anywhere. ALSO be careful how deep you drill, might get into the reservoir if you go too deep. you will certainly void any warranty if you do drill. Others can weigh in on the bellows. My Dart is missing its and there was a slight seepage for 4+ years when the car sat, that ran down the inside of the firewall and dissolved the paint on the floor under the carpet.
