hey i found somebody whos selling a b20b motor he said it has 30 to 48 thousand miles one it for 450$. so my qeustion is that worth it? and what else would i need to drop it inot a 91 civic si. i also heard that it is better to run a si tranny, so could i just use a 1st gen sir cable tranny and bolt it right up? and if so how much do they run for? and were could i find one? with and intake exhaust and header im geussing id be running low 15's (please correct me if im wrong). your help would be greatly appreciated! thanx