Guidance on electrical parts

ready to buy my electrical parts for the new wiring harness. my question is which ones to buy. i have the following parts already.

Year one reprodution wiring harness modified for electronic ignition part #HU228AM. IT states to use 70 and later alt and voltage regulator

Prestolite electronic distrubutor conversion part #MRE3690426 from mancini racing.

Alt- which one to use, 50A/60A 1 wire or 2 wire and what brand
Voltage Regulator- what brand to use.
both of the above products need to be 70 and later.
starter relay- brand
starter- brand
spark plugs- brand and part number.
as always thanks in advance for the great info. bruce