ha read up on 302ci, heres a couple quotes from wikipedia and other sources
Ray Goodman was down from Boerne, Texas near San Antonio doing some testing getting ready for the new season in his A/EA Under Cover Chassis Comp. Eliminator Car running a 302CI SBC with 1 Carb. on Racing Fuel putting out 770 HP. He ran a lifting 7.579 E.T. at 172.92 MPH. to take home $150.00 for the Quickest 1/4 Mile Open Wheel Car.
302 Chevrolet produced a special 302 in³ (4.9 L) engine for Trans Am racing. It was the product of placing the 3-inch stroke crankshaft from a 283 into a 4-inch bore 327 block. This engine was only used in the first-generation Camaro Z28. Conservatively rated at 290 hp (216 kW), actual output was around 360 hp (for the standard 4-barrel carb) to 400 hp (with optional dual 4-barrel carbs and other performance parts checked off on the option list). This block is one of 3 displacements that underwent a transformation for the 1968/1969 period when the main bearing size was increased from 2.30 in to 2.45 in.
and it doesnt mention that large main size and good rod/stroke ratio have the dz coded blocks a 7500 rpm redline, with a unbalanced bottem end, balanced its good for around 9k
the problem after that is outflowing your breathing equipment