There is more to a composite lifter that just slapping them in. Go to classracer.com and go to stock tech and search that place. There are literally hundreds of posts on composite lifters. They are not a set it and forget it concern. They are high maintainence.
For the money you are spending you could buy a tight lash roller set up and be done.
I just broke in y own engine with 145 on the seat and about 330 over the nose. As long as you are competent in starting a fresh engine you should have no issue.
I start mine on 40 total, make sure both bowls have fuel in them and verify all electrical systems are good to go. My engines start in one or two turns.
That is THE issue starting flat lifter engines. Make them run.