I am wondering if you have considered getting a series of chinese engines? For instance, I needed a main needle for a 61 K&B engine. I was surfing around and saw a complete LEO carb for $9. I bought 2 of them. I was looking for engines to put in that A-10 (hopefully), and others. I like K&B but I dont know how much I would like the jump to twins so I was willing to try cheaper brands. I went with GMS .25's.
Maybe something to consider. Everybody comes here for the prices. I am sure if you had those engines you could sell a bunch....

Please keep us posted on the A-10 and the Ultimate 60.
Thanks