I'm assuming you mean 'gold coast' theme parks? Sorry - Parkz is often seen as gold coast centric despite all efforts not to be so I just wanted to check...
There have been a lot of changes to restraints in the parks in the past 6 years or so. Some rides that were previously not an issue now have shorter seatbelts or tighter locking positions than previously.
And one ride to the other doesn't necessarily guarantee things either - for example despite being the same manufacturer a few years apart with what looks to be the same size seats, Rivals is far less forgiving than Steel Taipan for example. That said, Rivals is still far more generous than the Claw.
I know someone similar size to you (you're a bit taller) who doesn't have many issues with anything at the parks, so I'd say you'll be ok (except maybe the recent changes to MDMC). The worst ones I know of are Giant Drop, Claw and Vortex for larger folk, with Giant Drop being the most generous of the three.
The good thing about giant drop is that it is an enclosed station, with only a handful of riders, so you can try there first with minimal exposure if you're worried about embarrassment. If you fit on giant drop without an issue, head for claw (and you won't need to worry about Vortex either)
The only other wildcard will be Motocoaster. I believe there have been recent changes to the harnesses, and they are less forgiving on the leg size than they used to be. It has a test seat near the queue entrance so you can give it a try before lining up, and that is fairly out of view too.
End of the day - you're there for a great time after getting married. Don't give a stuff what anyone else thinks and just give it a go if you want to go on the ride. I know several ride operators on the coast and they're all geared towards giving you the best day possible - they'll try everything they can to help you get on, and know all the tricks to get a harness 'one more click' so you can ride - so don't be afraid to jump on and give it a try.
(lastly, since you're coming up next week - you're outside of peak periods, and midweek days aren't likely to be busy - so you can take your time without feeling rushed trying to fit in properly)