Couple options: One is look through summit or jegs, or I can look up a p/n for you and you can check local part stores for it but a couple companies sell junction bolts. Its a stud molded into a plastic housing, you mount it somewhere and make all the connections there...
2: Make your extra charging wire connections go straight from the back of the alt to the pos terminal of the battery itself, not the relay. The battery acts as a natural voltage stabilizer so its good to have the charge source go directly to it. The rest of the car is still attached to the battery and will pull its voltage from there...
3: Do both, that will give you a good clean junction bolt to tie everything together without piling things up on the relay stud, and you'll have a good charge on the battery at all times and simplify the install a little bit. It will also give you a good spot to pull batt power from under the hood when you add headlamp relays or other accessories
It was also showing 14.38V with everything turned on, engine still cold right after choke came off at idle.