Some of this info might help identify:
Torker 280 has a Gusset with an oval hole, others have a round hole between the top tubes & the downtube, the standard Torker didn't.
The Haro's have a Gusset under the downtube, and are very similar to the Torker, as early one's were made by Torker (apparently Bob Haro worked for Torker before going it alone)
The Ammaco's sometimes had a hole with a line through it (cut outs) on the rear dropouts & between the toptubes.
DP Firebird had a larger plate around the seatpost joining the toptubes & seatstays with the seatpost tube, and no gusset.
But as before mentioned there were alot out there back in the day, best thing would to see if you can find a similar on http://www.bmxmuseum.com/
Here's some pic's of my Torker 280, so you can see if yours is similar.