Are legend jets good?I saw they sell a pump kit that is moved back 6" or how about agressor ?Are thier any advantages to buying one of these jets? The reason Im asking is Im planing on having my jet flowed this winter and while I had it out I thought I would move it back and these seam to come with everything to do so?Im also planning on biulding a 502 with edel. 6045 alum. heads.110 cc 2.19 int./1.88 ex. want to be around 600 horse power at 5500 wiend tunnel ram 9.8 comp.950 dbl pumper,basset headers,complete msd system or mag. any suggestions on a cam sahft?