new cam- time to tune

just put in a new cam and now i need to tune my distributor.Whats the bbest way to go about this? I dont have a lot of tools so i have to rely on eyes and ears.Ive already set initial at 14 degrees and closed off vacuum advance can. Its an adjustable can.It doesnt ping unde load, makes good power but i think theres more in that mule. Motor is a 390 with holley 600, performer intake and headerswith pertronix ign.

Can you borrow a timing light to read the total adavance? Only a guess what to do with the mechanical advance without knowing what the total is and at what rpm it's coming in at...