72 Demon starts bogging sporadically once warm

Hopefully a new pump resolves the issue, when an engine is set up for 1/8th or 1/4 mile racing only, there is little thought or need to make it reliable for any distance. The car I have been working on this year was set up for 1/8th mile, has required several major changes and more to come. A little patience goes a long way to gaining experience. Keep us posted.