hard to start, Turning over very slowly Options

[North Coast Jim]

New build just finished. Engine runs and a few items remain to be sorted out such as carb jetting and final timing. Issue is the starter turns over S-L-O-W-L-Y. I'm using the original relay board and jumpered across per a previous posting for ground location, see attachment. Bought and installed the Tangerine Racing carb conversion fuel pump with SS lines and installed it under the steering rack. Ran 12V wiring thru tunnel where the old return line was. I also bought a rebuilt Bosch starter and alternator from Pelican and a new alternator harness for Jeff Bowlsby which included the wiring for the starter. New Hot lead to the starter as well. New battery, a red top Optima. Any guidance on a fix is appreciated. Ignition switch ???? How to fix ??

[porschetub]

You mentioned you are using ''running in'' oil,has the motor been reconditioned ?,if so it may just be tight.
Get your multimeter and attach the probes to the battery then get someone to crank it over and see what voltage drop you have,you could also do the same @ the starter.
IMO its not safe to assume it isn't the ignition switch,they don't always fail straight off,mine caused several different faults before finally packing it in,burnt/worn contacts in the start position of the switch could be robbing power from the battery surely.
Good luck.