I am eye balling a 1966 vw beetle. The current owner has upgraded the electrical system from 6v to 12v. No biggie there, really, but an upgrade nonetheless. I told this was a very good upgrade and worth every penny. Primarily due to the fact that the electrical system was running very light due to lack of power, as well as 6v replacement items are getting harder and harder to find. So the upgrade to the 12v makes sense. (this is not a big concern yet)
The second upgrade that this owner has done, was convert the original 1300cc engine to a 1500cc engine. Most of the time, I think the majority of people would be excited to have a larger engine already installed and would be content as is. I'm sorry, I am not one of those people. The deck lid has the original 1300cc emblem still in place. The 1300cc engine, from what I have read was a special sized motor for that year. I am one that likes things to remain "original", especially in a classic/collectible car such as this. Personal preference, yes. But, I'd still like to see the original motor in place.
Although the upgrades are not a bad thing at all, they are still not original.
So, with that little bit of info....... IF, I wanted to downgrade that 1500 to a 1300, would I be opening a whole new can of worms in doing so? Meaning, if I change that, is there a chain reaction of items that would need adjusted due to the downgrade? Would anyone else do this or would you leave the 1500cc in place?
Is my thinking a$$backwards? Would anyone else do this downgrade?
You will probably be asking........will it be an everyday driver or see the road more times than not.....answer, right now, is no. I'd like to restore it and occasionally take it out. On non rainy/snowy cold days

On a side note, is there anything I can refer to, that would tell me that every component that has been changed to fit the 1500, has in fact been changed? Meaning, i have all the right equipment. This also includes the 6v to 12v system. Is there a list of things to double check to make sure it was done correctly