I am 6'6 and weigh in at around 301 pounds atm.
I will say this, CP has more restricting rides. Do not get your hopes up. It is not kind on those who have bigger thighs (like I do) or a bigger chest.
Maverick is IMHO your best bet. Maverick is very very accommodating. I would check out the test seat before hand, but I have never witnessed a Walk of Shame on Maverick or even been remotely close to one. Blue Streak as well is something I could see you doing. Only requires I believe one click.
GateKeeper and Valravn in big boy seats may give you a chance, BUT I had more issues fitting into Valravn and GateKeeper than I had with Banshee. Banshee (even before I lost some weight) I could fit with a push down in a regular seat. At CP up until my most recent visit, being in the Big Boy seat was a necessity or otherwise a Walk of Shame was likely.
I went to CP in 2017 and 2018.
2017 through 2018 I had a mostly stable weight of around 325-330 pounds. I have my weight more evenly proportioned than most can, so I was able to buckle in on TTD, MF with no issues(waist is around 42 then) Maverick I fit with ABSOLUTELY no issues, none, with a large amount of slack in the seat belt.
I DID NOT fit on Steel Vengeance in July 2018 and was particularly upset about it. I was about thisclose. But nada. Ive recently started on my weight loss journey and have come to lose about 21 pounds thus far since my accurate weight measuring began(and I am estimating around 35 pounds from my peak in late 2015 - early 2016).
I came back on September 15th and found myself surprised. The OTSR of Raptor, Rogarou fit immensely better to the point I did not need a push by a ride operator to get in. TTD and Millie which I could get in before was much easier. I checked the test seat for SteVe, no green light.... but then I got to the station... I fit on Steel Vengeance... With absolutely no issues (not even a recheck or a "5-4") I checked the Wicked Twister test seat and I was ACTUALLY CLOSE to fitting (something I had never seen before)
Im lucky that I am tall which has helped me proportion my weight. But I know what it is like to fear going to an amusment park and worry whether you can enjoy a ride or not. Do not feel like you are less than who you are if it does end up being you cannot fit.
I still have a long journey to go but its very encouraging to see results.