That trip sound great
Will be good take with You:
Points, condenser, cap, coil, fan belt, radiator hoses, jumper wires, botle of water, one liter of engine oil and maybe a replacement fuel pump
I only made a trip from Oaxaca to Veracruz with out problems thank to good, I have been deseiring make a trip from Veracruz to Acapulco
Enjoy Your trip