Invest in an R block, much stronger webs & pan rail than the stock 340/360 blocks.
I'm hoping to card a 9.90-something with 368" in my 3000lb footbrake Duster myself. Combo's fairly basic & posted on my "toy" website, http://topside.info.
Then, after I get thrown out, the plan is to just run low 10s so I don't have to jump through the 9.90 hoops...