MaxRequestLen 2147483648
FcgidMaxRequestLen 2147483648

Note the comment:
Important to note if you are coming from Media temple:
/var/www/vhosts/your_domain_name_here/conf/last_httpd_ip_default.include
Gets overwritten on some updates: the file says to user
your_domain_name_here/conf/vhosts.conf which works.