Contemplating have a BB 455 Olds built for my 64 F-85 however with all the LS conversions going on seeing what's out there already done sitting around in your shop! Like to stay 91-93 octane friendly, build sheet and who built it, 440-500 HP range, enough vacuum for power brakes. Will bolt this up to a modified 2004-R. Will not rule out a well built Olds BB 400E ( 65-67 442 only motor) or a 425. Any leads would be appreciated. Thank you.