A little more info-from the net.
This is the dealership I remember seeing when I was visiting my grandparents every summer. They lived in Maspeth. They also did GTO's and some big body Pontiacs.Quite a site for a car crazed yute from the sticks of Long Island.
"Myrtl Motors Corp. was located at 61-20 Fresh Pond Rd., Maspeth, NY. Myrtle Motors was also in the business of “tweaking” Pontiacs for customer enjoyment, just like Royal Pontiac. Although they never garnered the attention Royal Pontiac did, Myrtle Motors built some very stout cars. The mods performed by Myrtle Motors to the 428 powered Firebird were almost identical to the famous Royal Bobcat package. The cost ranged from $2,781.00 to $5,149.74. Myrtl also modified GTOs.)
1968 Firebird 428 TH-400, 3.90 posi-Traction 12.55 @ 110 mph
Addtl times: 0-30 mph : 3.0 sec, 0-60 mph : 4.9 sec
Options: PB, P/S Wt : 3800 (curb) Magazine : PHR (9/68)
Notes: This was Myrtle Motors conversion car. Myrtle Motors was also in the business of “tweaking” Pontiacs for customer enjoyment, just like Royal Pontiac. Although they never garnered the attention Royal Pontiac did, Myrtle Motors built some very stout cars. The mods performed by Myrtle Motors to this 428 powered Firebird were almost identical to the famous Royal Bobcat kit (level 2). Car had Ram Air. On stock F70-14 tires, the car ran 13.90 with severe tire spin. The car had 428 emblems on the hood, but for some odd reason, a 400 emblem on the trunk lid."
https://firstgenfirebirds.wordpress.com/dealer-modified-special-edition-early-firebirds/
https://myclassicgarage.com/social/posts/116567-forgotten-myrtle-motors-428-firebirds