can it be done?

hi im rebuilding a 1978 rs2000 that had a 2.1 pinto with 2.25 pistons

the whole engine has been completely stripped down so i have to rebuild

was thinking cossie but everyone has done it

so was thinking my duttom end with cossie head and twin 45s or 48s

this is my first build so want to do it right

any help and pics if been done?