I used to run 1200 grain Grizzlystiks out of my Black Widow longbow, but it was 75#; even then, there was quite an arc to them. I did manage to get my first ever pigs with them, two in fact, until I decided that for pigs, I'd be better served with 700 grains of CX350 out of that bow back then.
Here's my second ever pig, taken with the above set-up:
As you can see, it isn't very big. I shot it at about five or eight metres range, or something short anyway. That heavy arrow had a STOS broadhead, and hit her spine, dropping her on the spot. Back then, it surprised me that a little piggy's spine could stop such an arrow, but it sure did.
You'll have fun, for sure, with those big arrows, but if ever you want to, don't be concerned about going down to 700 grains or so.
Good luck, and knock 'em for six!
Ben