Not without changing more parts than you want to think about.
The 1967 transmission was "swingaxle."
The 1971 chassis was made for "independent rear suspension" transmissions.
You can put anything from 1969 on in your 71, because 1969 was the first year of IRS.
80W90 hypoid gear oil.
12 volt- 6 volt beetles were only made until '67, i believe.
It's on your steering column. VW stopped putting them in button form on the dash in 67
It'll go right on.
SAE 30 oil.
replace the fuel pump.
You can buy aftermarket headers with no heater boxes.
Use the clutch and shift the gears. Manual transmissions don't have dip sticks.
10 gallon fuel tank on '67 T1 (bug)
2.5 Quarts according to John Muir (How to keep your vw alive)
67 + 67 + 67 + 67 + 67 = 335
SAE 30 oil. This is a light engine oil which is generally meant for lighter air-cooled engines. Just look for "SAE 30". Beetles use about 2 1/2 quarts.