Since your budget is tight you might want to check out www.hotrodders.com classifieds there is a set of '66 289 Heads freshly surfaced with a fresh valve job,these will increase your compression and give you adjustable rockers all for $135.You need a cam and intake that will produce low and midrange torque check out this combo at www.summitracing.com put part# 09-0001 in search.This cam has increased duration in the exhaust which is a plus on SBF's for improved breathing.