Me and the kid went 305 sprint car racing this summer,he won the track championship. car with driver & ten gallons of alky weighed in at 1742. That motor would hike the front wheels on a good tacky track.
60 over 305 block,stock crank, 6.2 eagle rods, custom flat top ross pistons,total seal rings,550 lift schnieder flat tappet cam, block decked , stock 305 heads #602 ? no port or polish (rules) 184 intakes (unshrouds em) all light weight Fierra valves, Fierra light weight lifters, crane springs & roller rockers, heads milled,stock oil pump,cheap Ebay jap copy nascar style intake,750 holley homebuilt alky carb,vertex magneto. complete motor including machine work, minus fuel & ignition system cost me about $4.500 . I don't have any dyno numbers but I would almost bet ya that motor was class of the field ,a buddy had built a very similar motor with 30 over bore and 5.8 rods for his 305 sprinter he also did the 4 - 7 firing order swap, that one has dyno sheets @ 364 horses ( his word I haven't seen the sheets) but since done by a pro engine shop, cost a considerable amount more than mine. My kid can pull him on a straight away drag race ( I contribute it to the 6.2 rods ??)
We ran 27 shows this season,turned it 7200 rpm and I just finished getting it ready for winter storage, backed the rockers off and did a leak down wich showed perfect,pulled the pan and looked at a couple rod and main bearings and they looked very good although I will put new bearings in this spring. All in all I've been very impressed with these 305's..... Butttt still there ain't no subsitute for cubic inches...