We use an Alston drag chassis with 4link, hooks up at all speeds. 288 mph + goodyear 2222 tires, the kind everybody says not to use except Gail Banks, Goodyear, and a few others. We wanted to use Lamb struts but the story we got was they were concerned about the weight of the hemi and blowers in front. Banks used them on his Firebird,wide tires also.
We went with Stock Car Products swingarm & antiroll bar,about 20 degrees castor. I wish had a rear antiroll bar too.They are availble now.
Go to Getting ready for bonneville in the build diaries to view car.Your on the right track,have it welded by a certified welder.We have chromemoly but wish we had gone with mild steel,welding chromemoly takes certain steps that most welders don't know,& you will have to weld brackets occasionly.
Good luck JL222