i have an 08 bullitt.,the car currently has a stock engine, cmdp, 3 inch dynomax cat back exhaust, thp single turbo kit 61 mm billet wheel-10 psi, tr6060, fuel is provided by a gt500 dual pump kit, 93 octane and 60 lbs injectors. 510/530 rwhp. currently i have a spare stock 08.5 + 3v long block on a stand for a build set to the side for a future build. I plan to run a dedicated e85 fuel system and big id1300s with a built motor, reusing the turbo and seeing what 15psi nets, it's a T4/61MM A/R.70. I'm now considering a frpp b53 or the brenspeed b326 versus building the spare 4.6 like planned. i followed a lot of Bruce's posts years ago and believe he was onto something with advocating for the potential of the boss block. i do remember a lot of concern about the main caps early on. was that concern substantiated? honestly i don't care about the weight if the 5.3 makes sense if i chose the 5.3 (brenspeed) with say 9.6 and the upped fuel system + boost on e85 would that net me in the territory (15+/-) of near 700rwhp/750rwtq? or more like 650/700? or...? fwiw I'm not building a race car. it's just a cruiser and casual car show car. it'll occasionally see the track but all out drag isn't a priority and don't plan to rev super high. I would like to participate in half mile events though.