671 on 440 Wedge Motor starts very hard when cold
I have a .060" over 440 with a 671 around 8.7to 1 compression (has 10 1/2 to one pistons but put .100" Flatout Copper shims plus Felpro rings gasket to take compression away) solid lifter cam 550 lift int .570 exh. around 290 dur. 2 660 holley boost referenced. I Have now a 44 top pulley & 33 bottom pulley well underdriven (didn't want allot of boost), about 18 deg timing. has a mini high torque starter twin Optima batteries pump gas 93 Oct. Starts very very hard & whipping throttle to keep running once everything gets hot it will idle but high. Wanting to street it only, but baffled why it starts so hard . Crank-crank-crank...Pump-Pump-Pump before it starts and usually hits2 or 3 times & dies before it actually starts. This is my first blower so I'm a novice for sure. Any Hints gratefully Appreciated
Thanks